1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 * 5 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 6 */ 7 #ifndef __ASM_ARC_PTRACE_H 8 #define __ASM_ARC_PTRACE_H 9 10 #include <uapi/asm/ptrace.h> 11 12 #ifndef __ASSEMBLY__ 13 14 /* THE pt_regs: Defines how regs are saved during entry into kernel */ 15 16 #ifdef CONFIG_ISA_ARCOMPACT 17 struct pt_regs { 18 19 /* Real registers */ 20 unsigned long bta; /* bta_l1, bta_l2, erbta */ 21 22 unsigned long lp_start, lp_end, lp_count; 23 24 unsigned long status32; /* status32_l1, status32_l2, erstatus */ 25 unsigned long ret; /* ilink1, ilink2 or eret */ 26 unsigned long blink; 27 unsigned long fp; 28 unsigned long r26; /* gp */ 29 30 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0; 31 32 unsigned long sp; /* User/Kernel depending on where we came from */ 33 unsigned long orig_r0; 34 35 /* 36 * To distinguish bet excp, syscall, irq 37 * For traps and exceptions, Exception Cause Register. 38 * ECR: <00> <VV> <CC> <PP> 39 * Last word used by Linux for extra state mgmt (syscall-restart) 40 * For interrupts, use artificial ECR values to note current prio-level 41 */ 42 union { 43 struct { 44 #ifdef CONFIG_CPU_BIG_ENDIAN 45 unsigned long state:8, ecr_vec:8, 46 ecr_cause:8, ecr_param:8; 47 #else 48 unsigned long ecr_param:8, ecr_cause:8, 49 ecr_vec:8, state:8; 50 #endif 51 }; 52 unsigned long event; 53 }; 54 55 unsigned long user_r25; 56 }; 57 #else 58 59 struct pt_regs { 60 61 unsigned long orig_r0; 62 63 union { 64 struct { 65 #ifdef CONFIG_CPU_BIG_ENDIAN 66 unsigned long state:8, ecr_vec:8, 67 ecr_cause:8, ecr_param:8; 68 #else 69 unsigned long ecr_param:8, ecr_cause:8, 70 ecr_vec:8, state:8; 71 #endif 72 }; 73 unsigned long event; 74 }; 75 76 unsigned long bta; /* bta_l1, bta_l2, erbta */ 77 78 unsigned long user_r25; 79 80 unsigned long r26; /* gp */ 81 unsigned long fp; 82 unsigned long sp; /* user/kernel sp depending on where we came from */ 83 84 unsigned long r12, r30; 85 86 #ifdef CONFIG_ARC_HAS_ACCL_REGS 87 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */ 88 #endif 89 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 90 unsigned long DSP_CTRL; 91 #endif 92 93 /*------- Below list auto saved by h/w -----------*/ 94 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11; 95 96 unsigned long blink; 97 unsigned long lp_end, lp_start, lp_count; 98 99 unsigned long ei, ldi, jli; 100 101 unsigned long ret; 102 unsigned long status32; 103 }; 104 105 #endif 106 107 /* Callee saved registers - need to be saved only when you are scheduled out */ 108 109 struct callee_regs { 110 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 111 }; 112 113 #define instruction_pointer(regs) ((regs)->ret) 114 #define profile_pc(regs) instruction_pointer(regs) 115 116 /* return 1 if user mode or 0 if kernel mode */ 117 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 118 119 #define user_stack_pointer(regs)\ 120 ({ unsigned int sp; \ 121 if (user_mode(regs)) \ 122 sp = (regs)->sp;\ 123 else \ 124 sp = -1; \ 125 sp; \ 126 }) 127 128 /* return 1 if PC in delay slot */ 129 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 130 131 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 132 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 133 134 #define STATE_SCALL_RESTARTED 0x01 135 136 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 137 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 138 139 #define current_pt_regs() \ 140 ({ \ 141 /* open-coded current_thread_info() */ \ 142 register unsigned long sp asm ("sp"); \ 143 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 144 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 145 }) 146 147 static inline long regs_return_value(struct pt_regs *regs) 148 { 149 return (long)regs->r0; 150 } 151 152 #endif /* !__ASSEMBLY__ */ 153 154 #endif /* __ASM_PTRACE_H */ 155